Hello, I think we made a mistake, but without knowing exactly what was the right procedure.
In fact we had when purchasing on Envato, chosen to install this theme on this URL: https://blog.derosieres.net.
But very soon we, we realized that we had to have another copy of your theme in order to be able to test its functionality and to be able to do tests, without this altering the version in production.
For this reason, we have installed another version at: https://dev.derosieres.net.
But in the meantime we have chosen to modify our urls, but to keep the same idea, namely, the version in production on the url: https://blog.derosier.es and a version under test on https: // dev .derosieres.net.
In short, what must be done for it to work, install the two copies on the same domain: derosier.es and then install them on the subdomains "dev" and "blog"?
Or is it possible to have a copy like right now on https://dev.derosieres.net and one on https://blog.derosier.es?
Or whatever, but do not exceed 2.3 copies of your theme ... in short, thank you in advance for your help

Merci, thanks it's work!

Have a nice day, and take care